EP0395604B1 - Centrifugal pump - Google Patents
Centrifugal pump Download PDFInfo
- Publication number
- EP0395604B1 EP0395604B1 EP90850102A EP90850102A EP0395604B1 EP 0395604 B1 EP0395604 B1 EP 0395604B1 EP 90850102 A EP90850102 A EP 90850102A EP 90850102 A EP90850102 A EP 90850102A EP 0395604 B1 EP0395604 B1 EP 0395604B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- impeller
- insert part
- centrifugal pump
- cutting means
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
- F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2261—Rotors specially for centrifugal pumps with special measures
- F04D29/2288—Rotors specially for centrifugal pumps with special measures for comminuting, mixing or separating
Definitions
- This invention concerns a centrifugal pump for pumping liquids containing solid bodies, such as rags and other elongated objects.
- the centrifugal pump which sucks the liquid into its center and throws it outwards in the direction of the periphery, has good qualities when pumping clean liquids.
- the liquid contains solid bodies, however, the problem arises that these may got stuck between the pump impeller and the surrounding pump housing and cause a stop or at least a decreased pumping ability.
- a way to solve these problems is to design the pump in such a way that the impeller rotates beside the flow itself, so-called vortex impellers.
- vortex impellers By this the clogging problems may be essentially solved, however, at the cost of other disadvantages, such as a decreased efficiency.
- the front end of the impeller is provided with two cutting means which cooperate with the inlet of the impeller for cutting the pollutions. It turns out, however, that the under pressure in the pump inlet makes an incoming rag to get sucked into the center of the impeller. Smaller rags may then rotate together with the impeller without making contact with the cutting means. Bigger rags may cause an increasing rotary resistance, sometimes to such a degree that the pump stops.
- the two described impellers have in common that they are both of the so-called open type. This means that the impeller has got only one cover disc on which the vanes are mounted and that the impeller is open towards the cutting means. This embodiment depends on the fact that the prevailing opinion has been that only open impellers are possible to use when pumping strongly polluted liquids.
- the closed impeller which is provided with two cover discs and vanes therebetween, has above all the advantage that its efficiency is far better than that of an open impeller.
- US-A-1551 918 shows a complicated device where a closed impeller is used and which includes two cutting devices and an intermediate room where rags etc are bound to clog.
- Fig 1 shows a section view of a submersible pump provided with a device according to the invention, while Fig 2 shows the device in more detail.
- Fig 3 and 4 show two sections of the impeller.
- FIG. 1 stands for a pump with a pump housing 2 having an inlet opening 3 with an insert part 4 provided with grooves 5.
- 6 stands for a centrifugal impeller with inlet, hub 7, primary cutting means 8, secondary cutting means 9 and projections 10.
- 11 and 12 stand for the upper and lower cover discs respectively of the impeller 6.
- 13 stands for vanes, while 14 and 15 stand for collars on the lower cover disc 12.
- the pump impeller 6 is thus designed with a cylinder-formed hub 7, which extends downwards into the inlet opening of the pump housing 2.
- a number of cutting means 8, 9 are arranged on the inlet 3, which cooperate with axially directed grooves 5 in the inlet opening to cut pollutions in the water to be pumped.
- the impeller is further designed with two cover discs 11 and 12 and intermediate vanes 13.
- the cover disc 12 is provided with a collar 14, which surrounds the upper end of the insert part 4, thus obtaining a radial seal.
- This seal which may have a length of between 3 and 6 mm, prevents effectively material from entering along the underside of the cover disc 12 and cause clogging.
- a similar radial seal is created between the collar 14 and the part of the pump housing 2, which is situated radially outside said collar.
- the lower cover disc 12 is provided with a collar 15, which extends a distance inwards over the insert part 4, thus creating an axial seal which additionally decreases the risk for the cut material being fed below the cover disc 12.
- a pump is obtained which has very good qualities when pumping strongly polluted liquids.
- the closed impeller has a far better efficiency.
- the risks for clogging and over-load of the driving motor are considerably reduced as all material is cut close to the center of the impeller. This means shorter lever arms for the forces and thus less torque.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Extraction Or Liquid Replacement (AREA)
- Saccharide Compounds (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Lubricants (AREA)
Abstract
Description
- This invention concerns a centrifugal pump for pumping liquids containing solid bodies, such as rags and other elongated objects.
- The centrifugal pump, which sucks the liquid into its center and throws it outwards in the direction of the periphery, has good qualities when pumping clean liquids. When the liquid contains solid bodies, however, the problem arises that these may got stuck between the pump impeller and the surrounding pump housing and cause a stop or at least a decreased pumping ability.
- A way to solve these problems is to design the pump in such a way that the impeller rotates beside the flow itself, so-called vortex impellers. By this the clogging problems may be essentially solved, however, at the cost of other disadvantages, such as a decreased efficiency.
- Another way to solve the problems, is to arrange some form of cutting means in front of the impeller which cuts rags and the like and makes them possible to pump. An example of such a solution is shown in the US Pat
No 4 108 386. - In the known construction the front end of the impeller is provided with two cutting means which cooperate with the inlet of the impeller for cutting the pollutions. It turns out, however, that the under pressure in the pump inlet makes an incoming rag to get sucked into the center of the impeller. Smaller rags may then rotate together with the impeller without making contact with the cutting means. Bigger rags may cause an increasing rotary resistance, sometimes to such a degree that the pump stops.
- Another construction is shown in the Swedish published patent application No 444 969. Here a central body with cutting means is arranged, which body fills up the space in the inlet, thus diminishing the risk for the rags being sucked into the impeller center. This solution is normally working very well, but under certain conditions a rag may stick to the center of the impeller and get stretched outwards to the periphery between the impeller and the housing. The friction which derives from that might lead to an overload of the motor and release of the motor protection device.
- The two described impellers have in common that they are both of the so-called open type. This means that the impeller has got only one cover disc on which the vanes are mounted and that the impeller is open towards the cutting means. This embodiment depends on the fact that the prevailing opinion has been that only open impellers are possible to use when pumping strongly polluted liquids.
- The closed impeller, which is provided with two cover discs and vanes therebetween, has above all the advantage that its efficiency is far better than that of an open impeller.
- US-A-1551 918, shows a complicated device where a closed impeller is used and which includes two cutting devices and an intermediate room where rags etc are bound to clog.
- According to the invention, use of a closed impeller when pumping strongly polluted liquids has been made possible. This possibility brings about better efficiency and a longer bearing life time. In addition it gives a better cutting result, thus diminishing the risks for clogging and damage.
- The invention is more closely described below with reference to the enclosed drawings.
- Fig 1 shows a section view of a submersible pump provided with a device according to the invention, while Fig 2 shows the device in more detail. Fig 3 and 4 show two sections of the impeller.
- In the
drawings 1 stands for a pump with apump housing 2 having an inlet opening 3 with aninsert part 4 provided withgrooves 5. 6 stands for a centrifugal impeller with inlet,hub 7, primary cutting means 8, secondary cutting means 9 andprojections 10. 11 and 12 stand for the upper and lower cover discs respectively of theimpeller 6. 13 stands for vanes, while 14 and 15 stand for collars on thelower cover disc 12. - The
pump impeller 6 is thus designed with a cylinder-formedhub 7, which extends downwards into the inlet opening of thepump housing 2. A number of cutting means 8, 9 are arranged on the inlet 3, which cooperate with axially directedgrooves 5 in the inlet opening to cut pollutions in the water to be pumped. - The impeller is further designed with two
cover discs intermediate vanes 13. Thecover disc 12, which is heading the pump inlet 3, stops a certain distance from thehub 7 thus creating a ringformed opening around the hub, through which opening the pumped medium is sucked into the impeller. - Pollutions in the liquid shall, as previously mentioned, be cut between the cutting means 8, 9 and the
grooves 5. Thevanes 13 and theinsert part 4 provided with thegrooves 5 with its end surface create together another cutting means which effectively mills the pollutions. When mounting, theinsert part 4 is brought into contact with the inner parts of thevanes 13, which gives a suitable cutting distance, when the impeller starts rotating. An additional advantage with the invention is thus that a correct distance between impeller and insert part is easily and automatically obtained. - In order to secure that the entire amount of cut material is brought into the impeller through the ring-formed opening, the
cover disc 12 is provided with acollar 14, which surrounds the upper end of theinsert part 4, thus obtaining a radial seal. This seal, which may have a length of between 3 and 6 mm, prevents effectively material from entering along the underside of thecover disc 12 and cause clogging. A similar radial seal is created between thecollar 14 and the part of thepump housing 2, which is situated radially outside said collar. - According to a special embodiment the
lower cover disc 12 is provided with acollar 15, which extends a distance inwards over theinsert part 4, thus creating an axial seal which additionally decreases the risk for the cut material being fed below thecover disc 12. - By help of the invention a pump is obtained which has very good qualities when pumping strongly polluted liquids. As compared with previously used open impellers, the closed impeller has a far better efficiency. In addition the risks for clogging and over-load of the driving motor are considerably reduced as all material is cut close to the center of the impeller. This means shorter lever arms for the forces and thus less torque. Finally there is no risk for collection of braking material between the impeller and the bottom of the pump housing.
Claims (4)
- A centrifugal pump for pumping liquids containing solid bodies and pollutions such as rags and other elongated objects and comprising a pump housing (2) having a central inlet (3) and a rotating impeller (6) designed as a closed impeller having upper and lower cover discs (11) and (12) respectively and intermediate vanes (13) and being provided with cutting means (8,9) which cooperate with an insert part within the pump inlet (3) which insert part is provided with grooves (5) which obtain a cutting between the cutting means and the edges of the grooves, characterized in that the lower cover disc (12) is provided with a collar (14) which surrounds the end of the insert part (4) heading the impeller (6) thus creating a radial seal.
- A centrifugal pump according to claim 1, characterized in that the collar (14) together with the part of the pump housing (2) radially surrounding said collar also creates a radial seal.
- A centrifugal pump according to claim 1, characterized in that the lower cover disc (12) is provided with a collar (15) which extends a distance inwards over the insert part (4), thus creating an axial seal between those parts.
- A centrifugal pump according to claim 1, characterized in that parts of the vanes (13), which are close to the hub (7) of the impeller (6) create cutting means in cooperation with the end of the insert part (4) heading the impeller (6).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8901534A SE466766B (en) | 1989-04-27 | 1989-04-27 | Centrifugal pump intended for pumping of liquids containing solid particles, for example, rags and other long-stretched objects |
SE8901534 | 1989-04-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0395604A1 EP0395604A1 (en) | 1990-10-31 |
EP0395604B1 true EP0395604B1 (en) | 1993-12-22 |
Family
ID=20375817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90850102A Expired - Lifetime EP0395604B1 (en) | 1989-04-27 | 1990-03-09 | Centrifugal pump |
Country Status (11)
Country | Link |
---|---|
US (1) | US5011370A (en) |
EP (1) | EP0395604B1 (en) |
JP (1) | JPH07111191B2 (en) |
AT (1) | ATE99025T1 (en) |
AU (1) | AU622763B2 (en) |
CA (1) | CA2015572C (en) |
DE (1) | DE69005351T2 (en) |
DK (1) | DK0395604T3 (en) |
FI (1) | FI101824B (en) |
NO (1) | NO172308C (en) |
SE (1) | SE466766B (en) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4128281A1 (en) * | 1991-08-27 | 1993-03-04 | Abs Pumpen Ag | Pump for handling domestic sewage - has disc with cutting blades arranged in front of pump inlet |
DE4338931C2 (en) * | 1993-11-15 | 1996-09-05 | Wilo Gmbh | Non-clogging centrifugal pump |
DE4438841C2 (en) * | 1994-11-02 | 1999-05-27 | Orpu Gmbh | Pump with a cutting device |
CH689058A5 (en) * | 1994-11-28 | 1998-08-31 | Haeny & Cie Ag | Centrifugal pump for contaminated with solids sewage waters. |
SE520417C2 (en) * | 1997-12-18 | 2003-07-08 | Flygt Ab Itt | Pump of centrifugal or semi-axial type intended for pumping of uncontaminated wastewater |
US6089823A (en) * | 1998-05-04 | 2000-07-18 | Ingersoll-Dresser Pump Company | Multi-stage vertical turbine pump with comminution |
SE520740C2 (en) * | 1998-06-30 | 2003-08-19 | Abs Pump Prod Ab | centrifugal |
DE20114891U1 (en) * | 2001-09-10 | 2001-11-15 | Grundfos As | Sewage centrifugal pump |
SE524048C2 (en) * | 2002-04-26 | 2004-06-22 | Itt Mfg Enterprises Inc | Device at pump |
SE525412C2 (en) | 2003-10-20 | 2005-02-15 | Itt Mfg Enterprises Inc | Centrifugal pump for contaminated liquids, comprises wheel with scoops and cover plates with spiral grooves around casing inlet |
US7037069B2 (en) * | 2003-10-31 | 2006-05-02 | The Gorman-Rupp Co. | Impeller and wear plate |
SE0402840L (en) * | 2004-11-19 | 2006-04-11 | Itt Mfg Enterprises Inc | Impeller |
SE531139C2 (en) * | 2007-05-08 | 2009-01-07 | Itt Mfg Enterprises Inc | Pump unit and method |
NO334954B1 (en) * | 2012-11-12 | 2014-08-04 | Agr Subsea As | Centrifugal pump impeller and its use in pumping drilling fluid containing drill cuttings |
WO2014145910A1 (en) | 2013-03-15 | 2014-09-18 | Pentair Pump Group, Inc. | Cutting blade assembly |
DE102014004420A1 (en) * | 2014-03-27 | 2015-10-01 | Wilo Se | Centrifugal pump with cutting device |
EP3449130B1 (en) | 2016-04-26 | 2022-11-09 | Pentair Flow Technologies, LLC | Cutting assembly for a chopper pump |
CN105971930A (en) * | 2016-07-11 | 2016-09-28 | 川源(中国)机械有限公司 | Centrifugal pump capable of improving flow capacity |
US11786091B2 (en) * | 2021-04-09 | 2023-10-17 | Dennis M. Delany | Vacuum grinder cleaning device and method |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US111026A (en) * | 1871-01-17 | Irvif | ||
US1448174A (en) * | 1918-03-15 | 1923-03-13 | American Manganese Steel Co | Centrifugal pump for dredging and conveying solids |
FR594899A (en) * | 1924-03-22 | 1925-09-22 | G Et Weir Ltd | Improvements to pump turbines |
US3692422A (en) * | 1971-01-18 | 1972-09-19 | Pierre Mengin Ets | Shearing pump |
FI49345C (en) * | 1972-05-15 | 1975-05-12 | Ahlstroem Oy | Device for preventing clogging of the sealing gap, especially in a sewage pump or the like. |
JPS4962504U (en) * | 1972-09-11 | 1974-06-01 | ||
DE2452548A1 (en) * | 1973-11-19 | 1975-05-22 | Sneek Landustrie | CENTRIFUGAL PUMP |
US3936758A (en) * | 1973-12-03 | 1976-02-03 | Exxon Production Research Company | Phase difference detector |
JPS5113403A (en) * | 1974-07-23 | 1976-02-02 | Toyo Denki Kogyosho Co Ltd | SUICHUHONPUYOKATSUTAAFUAN |
GB1551918A (en) * | 1977-02-09 | 1979-09-05 | Chittenden J B | Pump and macerator and pump assembly |
JPS5838396A (en) * | 1981-08-29 | 1983-03-05 | Ebara Corp | Grinder pump |
SE444969B (en) * | 1982-10-11 | 1986-05-20 | Flygt Ab | Centrifugal pump intended for pumping of liquids containing solid particles |
JPS6140795U (en) * | 1984-08-17 | 1986-03-14 | ソニー株式会社 | Electronic device lids |
JPS63188U (en) * | 1986-06-17 | 1988-01-05 |
-
1989
- 1989-04-27 SE SE8901534A patent/SE466766B/en not_active IP Right Cessation
-
1990
- 1990-02-05 US US07/475,461 patent/US5011370A/en not_active Expired - Fee Related
- 1990-02-08 AU AU49367/90A patent/AU622763B2/en not_active Ceased
- 1990-02-14 FI FI900736A patent/FI101824B/en not_active IP Right Cessation
- 1990-03-01 NO NO900981A patent/NO172308C/en not_active IP Right Cessation
- 1990-03-09 DK DK90850102.6T patent/DK0395604T3/en active
- 1990-03-09 DE DE90850102T patent/DE69005351T2/en not_active Expired - Fee Related
- 1990-03-09 AT AT90850102T patent/ATE99025T1/en not_active IP Right Cessation
- 1990-03-09 EP EP90850102A patent/EP0395604B1/en not_active Expired - Lifetime
- 1990-04-04 JP JP2090055A patent/JPH07111191B2/en not_active Expired - Fee Related
- 1990-04-26 CA CA002015572A patent/CA2015572C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
FI101824B1 (en) | 1998-08-31 |
NO900981D0 (en) | 1990-03-01 |
NO900981L (en) | 1990-10-29 |
DK0395604T3 (en) | 1994-01-31 |
SE8901534D0 (en) | 1989-04-27 |
AU622763B2 (en) | 1992-04-16 |
NO172308B (en) | 1993-03-22 |
CA2015572A1 (en) | 1990-10-27 |
JPH02286898A (en) | 1990-11-27 |
CA2015572C (en) | 1995-09-05 |
SE466766B (en) | 1992-03-30 |
NO172308C (en) | 1993-06-30 |
AU4936790A (en) | 1990-11-01 |
DE69005351T2 (en) | 1994-04-14 |
US5011370A (en) | 1991-04-30 |
FI101824B (en) | 1998-08-31 |
FI900736A0 (en) | 1990-02-14 |
DE69005351D1 (en) | 1994-02-03 |
SE8901534L (en) | 1990-10-28 |
JPH07111191B2 (en) | 1995-11-29 |
ATE99025T1 (en) | 1994-01-15 |
EP0395604A1 (en) | 1990-10-31 |
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